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just days ago, south carolina looked like it could be the third punch of a one, two three, mitt romney primary knockout. but this morning, ohio's republicans took away romney's first win, announcing rick santorum won the caucuses by 34 votes. then governor rick perry of texas pulled out of the race and immediately endorsed newt gingrich who's been surging in several new south carolina polls. >> a conservative visionary who can transform our country. we've had our differences, which campaigns will inevitably have. and newt is not perfect. but who among us is? the fact is, there is for...

Celebrating that being strik struck down. they're on the edge of their seats. that's because the same judge that struck it down is about to decide whether to live the stay that he put on his own watershed ruling allowing marriage licenses to once again be issued to same-sex couples before all the appeals in this case can be heard. and trust me, those appeals are going to go on for years. cnn correspondent dan simon is in the u.s. district courthouse in san francisco awaiting john vaughn walker's decision. he's on the phone with us right now. >> it cowl come down any second. i can't tell you ho...

That a lot of people are familiar with, just what happens to people when they go through often times because you can't target necessarily where the medicine is going to go. >> exactly. in the case of cancer chemotherapy, you want the medicine to go to the tumors and you don't want it to go to the intesti intestines, to the hair, where there are side effects. >> and at georgia tech, you can get it exactly where it needs to go using lasers, explain. >> it's a combination of a laser and small nano particles. we use the laser to heat up the particles. there's a chemical reaction that takes place w...